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Full Discussion: A better way to assign values to variables - shell
Top Forums Shell Programming and Scripting A better way to assign values to variables - shell Post 302916074 by SkySmart on Saturday 6th of September 2014 02:45:07 PM
Old 09-06-2014
Quote:
Originally Posted by Don Cragun
What OS are you using? /bin/sh varies considerably from system to system. (It is a 1980's vintage Bourne shell on some systems, a hard link or a symlink to a Korn shell on some systems, a hard link or symliink to bash on some systems, and there are lots of other possibilities on other systems.)

And, 4val is not a valid variable name (at least in Bourne, bash, and Korn shells where user defined shell variables start with an underscore or an alphabetic character; not a number).

I don't understand why you're using echo and awk to get the 2nd and 4th fields from constant strings. If the strings are constants, why not just use:
[CODE]VAL2=3[
VAL4=3/CODE]

So, if you aren't processing constant strings, where are they coming from? Are they already stored in a shell variable? Are they from the 1st line of a file?

Arrays can't be used on all UNIX systems with /bin/sh, but we can probably come up with something portable and efficient if you give us a better description of where the data comes from and what you want to do with it.

the os i'm working on varies, some are linux, aix, sunos, hpux.

the examples i gave, are really just examples.

so in the case of:

Code:
VAL4=$(echo "7 3 2 38 3")

please note, that the "7 3 2 38 3" are values from a different process which must be assigned. they are really not constants. they change.

looking for something like this that assigns by arrays?

Code:
NewVariable=${VAL4}[4]

this is just an example. im trying to grab whatever is in 4th field of another variable and assigninng it to a new variable?
 

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LEARN ABOUT OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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